Create a simple application that a Customer services representatives can use to create new customers or retrieve existing customer information from a text file $.$ To create the application, perform the follow steps and follow the illustrations a$.$ Create a customer class with the following fields Email address Phone number First name Last name $2$ Add a default constructor and save the file as Customer.java Create another class and save it as showCustomer.java. In the main method, prompt the user if he$/$she is a new customer or existing customer. If the customer is an existing customer, then